Lb7 idle surge in park

[Dalton mulhollem]

Hello, I have a 02 lb7 that only surges in park, not in drive but only in park and started smoking a good bit. Decently has a strong fuel smell. I replaced my fpr and that did not fix my problem. I have a ct3 so I checked my injector balance rates and the worst one was sitting around 1.2-1.3. I’m lost, anybody have any ideas?? Thanks.


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[Dalton mulhollem]

Hello, I have a 02 lb7 that only surges in park, not in drive but only in park and started smoking a good bit. Decently has a strong fuel smell. I replaced my fpr and that did not fix my problem. I have a ct3 so I checked my injector balance rates and the worst one was sitting around 1.2-1.3. I’m lost, anybody have any ideas?? Thanks.


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[TheBac]

Merged your threads and moved them into LB7 section.

Did you use an OEM GM FPR? You'll have to find out what your main fuel rate is in order to accurately see how the injectors are doing.

 

[Dalton mulhollem]

Thank you, but I got a oem Busch frp.


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[dirtydmax]

What's your rail pressure in park at idle?

 

[Dalton mulhollem]

What's your rail pressure in park at idle?

Sits at around 5,000 kpsi


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[dirtydmax]

Have you done a return rate test on injectors?Could possibly be returning too much as balance rates are only half of the equation

 

[Bdsankey]

Thank you, but I got a oem Busch frp.


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Not to beat a dead horse, where did you buy it from? I've seen MANY Chinese or low rate sellers actually advertise a Bosch part and it will not be a genuine part.

 

[Dalton mulhollem]

From the Dmaxstore


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[Bdsankey]

From the Dmaxstore


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They're reputable so that isn't a concern. Thanks for the quick reply!

Do you have any way to data log the truck?

Also, as recommended above by another user, checking return rates and balance rates is a great start. With balance rates you'll want to check main fuel rate as well.